Guaranteed 12/24 Delivery Still Available see item page for details! available on most items - Details
Talk to a Mustang Sales Tech
1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Find Underdrive Pulleys for your Mustang
2024-2025
2015-2023
2010-2014
2005-2009
1999-2004
1994-1998
1979-1993
Billet Pro Shop Underdrive Alternator Pulley; 25% Underdrive (07-09 Mustang GT500)Find parts that fit my vehicle
Item 438367
$0.00
Our Price
$59.00
Ship to: 43215
Please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
Will this fit your Vehicle?
Saved - View your saved items
We're sorry. We couldn't save this product at this time.
or use
Product Information
Description, Q&A
Features & Specs
| Brand | Billet Pro Shop |
| Pulley Type | Alternator Pulley |
Description
GT500 alternators are prone to failure; high revs are the main culprit. These units were designed to spin at a maximum of 17 to 18000 RPM. Since the vast majority of us have modded these cars and raised the rev limiter beyond the factory setting we often see failures. Our BPS 10% underdrive pulley will keep the alternator revs within a more reasonable range while allowing sufficient charging in the lower RPM band. Save yourself an alternator and minimize the chances of failure with this 15 minute pulley swap!
This pulley is an inexpensive insurance for the rpm issues and is highly recommended on all 2007-2014 MODDED GT500’s that spin the motor above the stock rev limiter setting (6250rpm)
25% underdrive pulley for those who spin their built motors above 7000 RPM. We have tested on our own shop car that with the 10% underdrive at 6800 RPMs the alternator does not charge anymore. Switching out to the 25% slows it enough to keep charging even at those higher RPMs.
This pulley is an inexpensive insurance for the rpm issues and is highly recommended on all 2007-2014 MODDED GT500’s that spin the motor above the stock rev limiter setting (6250rpm)
25% underdrive pulley for those who spin their built motors above 7000 RPM. We have tested on our own shop car that with the 10% underdrive at 6800 RPMs the alternator does not charge anymore. Switching out to the 25% slows it enough to keep charging even at those higher RPMs.
Fitment:
DetailsBillet Pro Shop P011-25
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
5.0
Reviews of Billet Pro Shop Engine Products (1)
Reviews of Billet Pro Shop Engine products have an average rating of 5.0 out of 5
Questions & Answers
No questions about this product yet.
Ask the First Question
Will It Fit My Mustang
- GT500 - 07, 08, 09
